Car-truck.



PATENTED MAR '3, 1908.

F. G. STEVENS.

CAR TRUCK APPLIOATION FILED NOV. 21. 1907.

Z SHEETS-SEEET 1.

WWWWQ 2? *3.

No. 880,833 PATENTED MAR. a, 1908.

F. c. STEVENS.

OAR TRUCK.

APPLICATION FILED NOV. 21. 1907- 2 sums-311mm 2 UNITED STATES PATENT ()FFlCE.

FRANK O. STEVENS, ORNORTH ANDOVER, MASSACHUSETTS, ASSlGNO'RTO DAVIS dc FURBER MACHINE COMPANY, OF NORTH ANDOVER, MASSACHUSETTS, A CORPORATION OF MAS- SACHUSETTS CAR-TRUCK.

Specification of Letters Patent.

Patented March 3, 1908.

Application filed November 21. 1907. Saris-1N0- 03.10?-

To all whom lit may concern:

Be it known that I FRANK C. STEVENS a citizen of the United States, and a resident.

of North Andover, in the'county of Essex and State of Massachusetts, have invented an Improvement in Car-Trucks, of which the following description, in connection with the accompanying drawing, is a specification,

like letters on the drawing representing like parts This invention relates to car trucks and especial] to industrial car trucks, that is, car truclfs for cars such as are extensively used in large manufacturing establishments for transferring articles from one part of the yard to another.

One of the objects of the invention is to provide a novel form of truck which permits the axles to freely turn into an angular position when the car is passing over curved portions of the track, and which provides a construction whereby the axles are automatically brought back to their central or normal osition after the curve is passed and without aving to be forced back to this position by the rails of the track.

Another object of the invention is to improve generally car trucks of this'ty e so as to simplify and cheapen the cost 0 manufacture thereof.

I will first describe one embodiment of my invention and then. point out the novel features thereof in the appended claims.

on the bearing member; Fig. 6 is a detail ofthe truck showing the way in which the springs are held in place; Fig. 7 is a perspectiv'e View of one of the spring-retaining niembers. F

The car truck herein shown comprises the two side sills 3 and 4 which are connected at provide each axle at each end with a sleeve 7 loosely mounted thereon, which sleeve has engagement with'the bearing member 6.

The sleeves 7 on each. axle are shown as being spaced and heldin their proper posi- 'tion by a central sleeve 8 which is also loosely mounted on the axle, and if desired said central sleeve may have extending therefrom a pivot pin 9 which extends through and is pivotally connected to the cross frame 5.

In the present embodiment of my invention the sills 3 and 4 rest on and are secured to the bearing members 6, and said bearing members have the laterally extending ears 10 to which the frames 5 are secured.

The bearing members 6 are yoke-shaped, they each being provided with downwardly extending arms 11 which are preferably of a length to extend below the sleeve 7. Each bearing member is provided with a bearing surface 12-whioh rests on the corresponding sleeve 7, and these bearing surfaces are of a turn relative to the truck when the car is passing over the curved portions of the track, and which will operate automatically to after the-curve has been passed.

Each axle and consequently each sleeve 7 is always maintained in a horizontal posi tion, and the bearing surfaces 12 are so designed that in every position of the axle the sleeve 7 will have contact therewith from one edge to the other thereof in a line of contact which occupies a horizontal plane.

lllhen each axle is in its normal position such as it would assume when thaear is run in full. lines Fig. 3, the line of contact between each sleeve 7 and its bearing surface 12 will be that illustrated. by the dotted line a, 'Fig. 3. When however the axle is swung into the dot-ted line positionFig. 3, the line of contact between each sleeve 7 and the bearing surface 12 is shifted into the position indicated. by the dotted lines b. To secure the results aimedat therefore requires that the curved surface 12 of each bearing member 6 shouldbe so designed that both the lines a and b, in Fig. 3, should be in horizontal lanes.-

12 a conical surface corresponding to that of a cone ha ing its apex atthe point where bring the axles back to their central position.

ning over a straight track, and such as shown I fin that by making each curved surface special shape which will permit the axles to the lines a and I) would meet if extended a curve of the desired eontour can be roduced. With such a construction it wil be seenthat'as the axles turn the sleeves 7 are rolled over the bearing surfaces 12 more or less dependent on the amount which the axle is turned, and that in so doing the bear- .ing members 6 and the car truck are raised slightl --owing' to the concavity of the curve surfaces 12. During the rolling contact between the sleeves 'Z and the bearing surfaces l2however each sleeve maintains atall times a line of contact with the corresponding bearing surface, which line of 'coning the pivotal pin 9 extending through the frame 5 to form anaxis or pivot about which also provided Wit said axle turns yet the presence of these piv-" otal pins is not necessary because the special curved shape of the bearing surfaces 12 will operate automatically to maintain the axles in their proper position. I

I may if desired connect the two arms 11 of each bearin member by a pin or rod 15 which extends, eneath the axle althou 11 this is nottessential to the invention. T e advantage of' using these pins is that they prevent the axle from dropping out from the bearing members in case the car should be tip ed u at one end.

'Fhe sill s3 and 4 sustain springs 20 on which the car body (not shown) is yield ingly supported. Each spring is confined be.

tween two similar spring-retaining members 0 and b of special sha e, one of which is secured to thesill and t 1e other of which is to be secured to the body. v

As stated above the two spring-retaining members of any pair are sirm er, and either one therefore may be secured to the sill.

The'vformof each s ring-retaining member is best seen from igs. 6 and 7-.- Each comprises a base piece 25 andtwo arms or j aws 26 extending therefrom, each arm being formed at its end with a nose or shoulder 27. The base of each s ring-retaining member is a shoulder 28 at each 'side,rand the portion 29 beyond the shoulders' 28 is'of the same width as the space between, the jaws or arms'26. In using these sprmg-retaining' members one member of a pair of members, for instance. the mel'nber c,

1s secured to the top of the sill with the arms 26 thereof extending upwardly and the other member 1 of the"pairiisbroughtinto operative relation to the member 0 by placing; theends 29 of each member between. the jaws 26 of the dtl'ier'member and booking the noses 27 of each member over the shoal ders 2.8 of the other member,,the spring 20 7% having been previously placed between the tWo base pieces 25, as shown in Fig. 6.

I/Vherethe two springdetaming members 0 and d of any pair are thus connected to gether the spring will be held in its priiper r. position thereby and the noses 27 will limit the expanding movement of the sprin while the colinpression of the spring due to aloaded truck is permitted by the portions 29 of each member playing between the arms 26 of the other member. s

In orderto prevent the two members of any pair from separatinr by movement lon gitudinally of said truck. I propose to arrange the pairs of members 0 and d reversely at each end of each sill, as best shown in Fig. 1. wherein the member 0 at one end of the truck is arranged w ith the arm 26 at the right hand end thereof while the member 0 at the opprr site end, of the truck is arranged with the arms 26 at the left hand end thereof.

The car body is to be supported on the base pieces of the. upper members of each pair. In this way the two pairs of spring retaining members at each side of the truck act in conjunction with each other to prevent the body from moving longitudinally of the truck.

;I have not attempted to describe all ernbodiments of my invention but have merely m selected for illustration one embodiment which is illustrative of the principle of the invention.

Having described my invention what I claim as new and desire to secure by Letters 10 Patent is 1- 1. In a car truck, the combination with an axle extending from'ohe side to the other of the truck, of a truck frame having a bearing member for each end of the axle, eachbearing member having a bearing an... on. a curve of greater radius than axle. I

2. In.a car truck, the combination with an axle extending from one side to the other of 1 v the truck and having a cylindrical bearing portion adj acient each end, of a truck frame 7 having a bearing member adapted. to engage each bearing portion of the axle, each hear ing member having a bearing surface formed on a curve of greater radius than that of the bearing portion of the axle. r

3. In a car truck, the combination with an axle having ateach end a (n 'lindrical bearing;

portion, of a truek frame having a i: member adapted torest on and eng bearing mortiolr of the aide; each I member havinga conical i suit. in to engage the cylindrical porti the'axlc.

{4min a car truck. thecomblriation. with 13o truck frame, of an' axle centrally pivoted thereto and having a cylindrical bearm portioi'iadjacent each end, said truck rame having a bearing member for each bearing portion of the aXle, each bearing member aving a bearing surface of conical shape formed on a curve of-much greater radius than that of the bearing portion of the axle. 5. In a car truck, the combination with an axle, of cylindrical sleeves loosely mounted on each end thereof, a truck frame having :1. yoke-shaped bearing member for engagement with each sleeve, each bearing member having a concavely curved bearing surface for the sleeve, which bearing surface is of greater radius than that of the sleeve.

6. In a cartruck, the combination with an axle, of cylindrical sleeves loosely mounted on each end thereof, a truck frame having a yoke-shaped bearing member for engngement with each sleeve, each bearing member having a conical bearing surface for engagement with the corresponding sleeve.

7. In a car truck, two similar spring-retaining members each having a base piece and parallel jaws extending therefrom, the jaws of each member having means to enl l l l a e the base of the other member in combination with a spring retained between said members.

8. In a truck, two similar springretnining members each comprising a base piece and. jaws extending therefrom and each provided with a nose 27., the base of one member adapted to be engaged by the nose of the other member in combination-with a spring retained between the base of said members. V

9. In a car truck two similar springretaming members each comprising'a base 25 having arms 26 extending therefrom and lateral shoulders 28, each arm haying a nose 27, the nose of the arms of one member being adapted to engage the shoulders 28 of the other mcmber'in combination with a spring co: fined between said members.

in testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

FRANK o. STEVENS.

Witnesses WILLIAM D. RUNDLETT, ALFRED (J. JENSEN. 

